package at.gv.egovernment.moa.id.util;

import java.util.Locale;

import at.gv.egovernment.moa.util.Messages;

/**
 * A singleton wrapper around a <code>Message</code> object, providing the messages used in MOA-ID.
 * 
 * @author Paul Ivancsics
 * @version $Id$
 */
public class MOAIDMessageProvider {
  
  /** DEFAULT_MESSAGE_RESOURCES are resources/properties/id_messages */
  private static final String[] DEFAULT_MESSAGE_RESOURCES =
    { "resources/properties/id_messages" };
  /** DEFAULT_MESSAGE_LOCALES are "de", "AT" */  
  private static final Locale[] DEFAULT_MESSAGE_LOCALES =
    new Locale[] { new Locale("de", "AT") };
   /** The instance for our singleton */  
  private static MOAIDMessageProvider instance;
  /** The Messages */
  private Messages messages;
  
  /**
   * Returns the single instance of <code>MOAIDMessageProvider</code>.
   * 
   * @return the single instance of <code>MOAIDMessageProvider</code>
   */
  public static MOAIDMessageProvider getInstance() {
    if (instance == null)
      instance = new MOAIDMessageProvider(DEFAULT_MESSAGE_RESOURCES, DEFAULT_MESSAGE_LOCALES);
    return instance;
  }
  
  /**
   * Create a <code>MOAIDMessageProvider</code>.
   * 
   * @param resourceNames The names of the resources containing the messages.
   * @param locales The corresponding locales.
   */
  protected MOAIDMessageProvider(String[] resourceNames, Locale[] locales) {
    this.messages = new Messages(resourceNames, locales);
  }
  
  /**
   * Get the message corresponding to a given message ID.
   *
   * @param messageId The ID of the message.
   * @param parameters The parameters to fill in into the message arguments.
   * @return The formatted message. 
   */
  public String getMessage(String messageId, Object[] parameters) {
    return messages.getMessage(messageId, parameters);
  }

}